Peteroa Volcano Active volcano 4 Eruptive column 4 Plinia 4 Sup-plinian eruption 4 Tephra 4 Volcanic plume 4 crystal 4 fumarole 4 plume 4 tephra 4 volcanic eruption 4 volcanic glass 4 Andean volcanic chain 2 Argentina 2 Carbon dioxide 2 Chemical signatures 2 Chile 2 Compositional changes 2 Degassing 2 Gas geochemistry 2 Gases 2 Geochemical volcano monitoring 2 Geochemistry 2 Geophysics 2 Hydrothermal fluids 2 Isotopes 2 Isotopic composition 2 Isotopic parameters 2 Magmatic degassing 2